Integrated Science
7th Edition
ISBN: 9780077862602
Author: Tillery, Bill W.
Publisher: Mcgraw-hill,
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Question
Chapter 11.3, Problem 12SC
To determine
The amount of usable uranium and plutonium present in the used fuel rods from a nuclear reactor.
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You are experimenting with a radioactive sample of polonium. At the end of 14.0 minutes,
exactly 1/16 of the polonium remains. The corresponding half-life, T2 , of polonium is:
a. 0.875 minutes.
b. 1.14 minutes.
c. 1.75 minutes.
d. 3.50 minutes.
e. 4.67 minutes.
5.
A 100 mg sample of radioactive iodine decays to 45 mg after 13 minutes.
a.
Determine the half-life of the sample, to the nearest hundredth. Then create the half-life equation.
How long will it take for the sample to decay to 10 mg? Answer to the nearest tenth of a minute.
b.
A beta particle is
A.a form of highly penetrating radiation .
B.an electron emitted by a larger nucleus .
C.the first particle emitted during radioactive decay .
D.a helium nucleus emitted by a larger nucleus .
Chapter 11 Solutions
Integrated Science
Ch. 11.1 - Prob. 1SCCh. 11.1 - Prob. 2SCCh. 11.1 - Prob. 3SCCh. 11.1 - Prob. 4SCCh. 11.1 - Prob. 5SCCh. 11.1 - Prob. 6SCCh. 11.1 - Prob. 7SCCh. 11.1 - Prob. 8SCCh. 11.1 - Prob. 9SCCh. 11.2 - Prob. 10SC
Ch. 11.2 - Prob. 11SCCh. 11.3 - Prob. 12SCCh. 11 - How is a radioactive material different from a...Ch. 11 - Prob. 2CQCh. 11 - Prob. 3CQCh. 11 - Prob. 4CQCh. 11 - What is half-life? Give an example of the...Ch. 11 - Prob. 6CQCh. 11 - Prob. 7CQCh. 11 - Prob. 8CQCh. 11 - Prob. 9CQCh. 11 - Prob. 10CQCh. 11 - Prob. 11CQCh. 11 - Prob. 12CQCh. 11 - Prob. 13CQCh. 11 - Prob. 14CQCh. 11 - Prob. 15CQCh. 11 - Prob. 16CQCh. 11 - Prob. 17CQCh. 11 - Prob. 1PEACh. 11 - Prob. 2PEACh. 11 - Predict if the nuclei in exercise 1 are...Ch. 11 - Prob. 4PEACh. 11 - Prob. 5PEACh. 11 - Prob. 6PEACh. 11 - Prob. 7PEACh. 11 - Prob. 1PEBCh. 11 - Prob. 2PEBCh. 11 - Prob. 3PEBCh. 11 - Prob. 4PEBCh. 11 - Prob. 5PEBCh. 11 - Prob. 6PEBCh. 11 - Prob. 7PEB
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- Suppose a radioactive nucleus has a half-life of 2 min. and suppose the counting rate at time t = 0 is 3000 counts/10 sec. a. What is the counting rate after 2 min? b. After 6 min? c. After 10 min? d. After 20 min?arrow_forwardIn nuclear reactor, the function of control rod is to:A. Control nuclear fission temperature.B. Absorb extra neutrons.C. Prevent leakage of radiation.D. Generate electricity from nuclear fission.E. Initial the nuclear fission.arrow_forwardQuestion 9 Why is a moderator required in a thermal nuclear reactor core? A To prevent overheating of the fuel rods. B To absorb surplus neutrons. C To shield the surrounding area from dangerous gamma radiation. To reduce the kinetic energy of thermal neutrons.arrow_forward
- a. To release 100 MW of power, approximately how many uranium fissions must occur every second? b. How many kilograms of U-235 would have to fission in 1yr to sustain a rate of 100 MW of power output?arrow_forwarda. What is the final product of U-235? b. What are the 10 intermediate nuclides?arrow_forward10.A radioactive material, such as the isotope thorium-234, disintegrates at a rate proportional to the amount currently present. If Q(t) is the amount present at time t, then dQ/dt = −rQ, where r>0 is the decay rate. a.If 100 mg of thorium-234 decays to 82.04 mg in 1 week, determine the decay rate r. b.Find an expression for the amount of thorium-234 present at any time t. c.Find the time required for the thorium-234 to decay to one-half its original amount.arrow_forward
- Which of the following is not necessary to sustain fission reactions in a nuclear reactor? O a. Proton bombardment of fissile isotopes (e.g., U-235). O b. Release of neutrons by bombarded fissile isotopes. O c. Fission of fissile isotopes, producing highly radioactive fission products. O d. Transformation of U-238 to Tc-99 through absorption of neutrons.arrow_forwardAfter a fission event, most of the energy released is in the form of A. Emitted beta particles and gamma rays.B. Kinetic energy of the emitted neutrons.C. Nuclear energy of the two fragments.D. Kinetic energy of the two fragments.arrow_forwardQ2(C). Use A(t )= A0ekt to determine how much of a 100-g sample is present after 250 years if the half-life of Uranium-232 is 68.9 years.arrow_forward
- Which expression correctly describes the radioactive decay of a substance whose half-life is T? A. N(t) = No e-(t In 2)/T B. N(t) = No et/T O C. N(t) = No etT In 2 D. N(t) = No etTarrow_forward4. A mine worker discovers an ore sample containing 500 mg of radioactive material. It was discovered that the radioactive material has a half-life of 1 day. About how much of the radioactive material will be present after 7 days? A. 3.9 mg B. 7.8 mg C. 15.6 mg D. 31.2 mgarrow_forward1. A stone is thrown vertically upward from the ground with an initial velocity of 128 ft/sec. How long it will take for the stone to reach the ground? 2. The rate of decay of radium is proportional to the amount present at any time. The half-life of radium is 1690 years and 20 mg of radium are present now. How much radium will remain after 1690 years?arrow_forward
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